The Chevy and GMC park lights are different.
Chevy's are the square ones mounted in the grille.
GMC's are the round ones mounted in the fender. There were two different sizes, one from 47-51(I think). The other for 52&53.
I've been searching but I have yet to find a good set. I don't think anyone reproduces the entire light.
I ended up using the 55-59 parklights with white lenses. They are far to big for the earlier size, but the 52&53 size isn't to far off.
Good Luck.
